异构无线网络自适应接入算法研究

在异构无线网络中,针对现存接入算法对网络高动态性考虑不足,提出了一种自适应的接入算法.算法能够根据网络环境中用户数量及带宽使用情况,估计接入阻塞率、最大化网络吞吐量,从而自适应地选择用户接入网络的行为.根据接收信号强度和可用带宽,计算出用户的最大传输速率;根据网络中已分配带宽、用户所需带宽,推导出网络剩余容纳用户数;根据新到达用户数、剩余容纳用户数估计用户接入阻塞率;结合最大传输速率和接入阻塞率,提出一种以最大化网络吞吐量为目标的自适应接入算法.仿真结果表明,算法能有效降低用户接入阻塞率,增加接入用户数,提高网络吞吐量,均衡网络负载,并且能够适应未来高动态性网络.

Research on adaptive access algorithm for heterogeneous wireless networks

In heterogeneous wireless networks, an adaptive access algorithm is proposed to solve the problem that the existing access algorithms are not sufficiently considered network with high dynamic. According to the number of users and allocated bandwidth, the algorithm can estimate the blocking rate and maximize the network throughput, so users can access network adaptively. Firstly, the maximum transmission rate is calculated based on the received signal strength and available bandwidth. Secondly, according to allocated bandwidth and the bandwidth required by users, the number of remaining service users is deduced. Thirdly, the blocking rate is estimated based on the number of new users and the number of remaining service users. Finally, combining the maximum transmission rate and blocking rate, an adaptive access algorithm aiming at maximizing network throughput is proposed. Simulation results show that the proposed algorithm can effectively reduce blocking rate, increase number of access users, improve network throughput, balance network load, and adapt to future high dynamic network.